You have a right mixture of errors,
F11 indicates that the pump is not working.
F05 indicates that the pressure switch is jammed on full.
F04 indicates that the pressure switch is jammed on empty.
I would start by checking the pump is working o/k.
Next locate and clean filter.
This can be found by removing the rear panel of washer.
Locate and remove large black hose onto tub, remove filter and clean, refit same, make sure hose is on properly.
Test for leaks.
If no improvement, then I think your only option is to call an engineer out as it could become quite involved.
Good luck.
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Thanks.

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Dont think its pressure switch.if sticks one way machine overfills the other brings on heater with empty drum..Could be fauly rinse solonoid valve...Check with multimeter coil should read around3k ohms..good luck

F04 - Pressure switch jammed on empty while F05 is a blocked filter.Check that the pump is working o/k, if it seems o/k and it drains o/k, then you have no alternative than to call an engineer.
This really is your only option.
Plz rate my solution
Thanks.

F04: possible filling or water level problem. Check water inlet pipe (or shut-off valve), or the outlet pipe, or the pump or pump filter if accessible (check for blockages or foreign objects). Also could be the water valve solenoid weak, causing filling to be too slow.